In an editorial with almost the same title, Kathleen Parker discussed the implication of recent study findings:

A new study reports that 42 percent of Internet users between the ages of 10 and 17 have viewed online porn.

This is major unresolved dilemma for parents. Porn is easily and freely available online for anyone. You can filter out the bad stuff coming into your home, but ultimately I can't see how you can really prevent your kids from accessing it at a friends house, a wi-fi hotspot, or somewhere else...if they really want to find it. What's a parent to do? I guess you have to just be really frank with your kids and explain why a lot of stuff that's out there isn't fit to be seen. Any other ideas?